package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Override
    @Transactional // 开启事务管理
    public void saveWithFlavor(DishDTO dishDTO) {
        // 将数据复制到菜品表
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 向菜品表插入1条数据
        dishMapper.insert(dish);

        // 获取insert语句的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();

        // 一个菜有可能有多种口味
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
                    });
        }

        // 向口味表中插入n条数据
        dishFlavorMapper.insertBatch(flavors);
    }

    /**
     * 分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        // 调用PageHelper小插件
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional   // 开启事务管理
    public void deleteBatch(List<Long> ids) {

        // 判断当前菜品是否属于起售中的菜品
        for (Long id : ids){

            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                // 当前菜品起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

            // 判断当前菜品是否被套餐关联
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
            if(setmealIds != null && setmealIds.size() > 0){
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }
        }

        // 删除菜品表中的菜品数据
        for(Long id : ids){
            // 删除菜品
            dishMapper.deleteById(id);
            // 删除口味
            dishFlavorMapper.deleteById(id);
        }


    }

    /**
     * 根据id查询菜品和口味
     * @param id
     * @return
     */
    @Override
    @Transactional  // 开启事务管理
    public DishVO getById(Long id) {
        // 根据id查询菜品
        Dish dish = dishMapper.getById(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);

        // 根据id查询口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }


    /**
     * 根据id查询菜品的基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        // 更新菜品信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        // 删除原有的口味数据
        dishFlavorMapper.deleteById(dishDTO.getId());

        // 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品数据
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> listByCategoryId(Long categoryId) {
        Dish dish = Dish.builder().categoryId(categoryId)
                    .status(StatusConstant.ENABLE).build();

        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
